LM51561: Bias current on Feedback pin.

Nassim Mediouni

Part Number: LM51561

Hello,

I would like to know the input current on FB pin of the LM51561.

My application requires few hundred volts at the output and to minimize the dissipation on the feedback resistors I will use high value for them.

The risk is that the high values for the feedback resistors impact the DC precision of my output voltage.

Best regards, Mediouni Nassim.

0 Moritz over 1 year ago

Hi Mediouni,

Thanks for reaching out.

The maximum input current on FB sould be below 100nA. So designing the Feedback divider to allow a current of 10uA to flow , should be ok.

For more information about design considerations for a feedback divider, please have a look at this application note: https://www.ti.com/lit/an/slyt469/slyt469.pdf?ts=1695905710970&ref_url=https%253A%252F%252Fwww.google.com%252F

Best regards,

Moritz

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